Former Rep. Ken Buck (R-Colo.) on Friday knocked Rep. Marjorie Taylor Greene (R-Ga.) for acting completely irresponsibly amid her opposition to delivering aid to Ukraine .

Greene has threatened to oust House Speaker Mike Johnson (R-La.) over his support for passing a bill that provides aid to the country in its war against Russia. Shes also shared false claims about the presence of Nazism in Ukraine, echoing some of the talking points embraced by Russian President Vladimir Putin.

Buck, who left Congress last month after announcing that he wouldnt seek another term, used his Moscow Marjorie nickname for the Georgia Republican during an interview with CNN s Erica Hill.

Well, Moscow Marjorie has reached a new low, Buck said, after Hill showed footage of Russian TV personalities claiming that Greene is running Congress and believes that Americans should help Putin win.

He added that during the Russian Revolution, American journalists who were writing glowing reports about Russia at the time were called useful idiots, and I dont even think that Marjorie reaches that level of being a useful idiot here.

Buck said that Greene is mouthing the Russian propaganda and really hurting American foreign policy in the process.

Shes acting completely irresponsibly, Buck said. When history looks at this period of time, Russia invaded Ukraine, Ukraine is fighting for its freedom, and we should be with the freedom fighters in this war.

H/T Mediaite